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Ucm6202 Firmware CVE-2020-5759

CRITICAL
OS Command Injection (CWE-78)
2020-07-17 vulnreport@tenable.com
Command Injection Ucm6202 Firmware Ucm6204 Firmware Ucm6208 Firmware
9.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
CVE Published
Jul 17, 2020 - 21:15 nvd
CRITICAL 9.8

DescriptionNVD

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. An authenticated remote attacker can execute commands as the root user by issuing a specially crafted "unset" command.

AnalysisAI

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as OS Command Injection (CWE-78), which allows attackers to execute arbitrary operating system commands on the host. Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via SSH. An authenticated remote attacker can execute commands as the root user by issuing a specially crafted "unset" command. Affected products include: Grandstream Ucm6202 Firmware, Grandstream Ucm6204 Firmware, Grandstream Ucm6208 Firmware. Version information: version 1.0.20.23.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Avoid passing user input to shell commands. Use language-specific APIs instead of shell execution. Apply strict input validation with allowlists.

More in Ucm6202 Firmware

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CVE-2020-5723 CRITICAL POC
9.8 Mar 30

The UCM6200 series 1.0.20.22 and below stores unencrypted user passwords in an SQLite database. Rated critical severity

CVE-2020-5726 HIGH POC
7.5 Mar 30

The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the CTI server on port 8888. Rated
CVE-2020-5724 HIGH POC
7.5 Mar 30

The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the HTTP server's websockify endpo
CVE-2020-5725 MEDIUM POC
5.9 Mar 30

The Grandstream UCM6200 series before 1.0.20.22 is vulnerable to an SQL injection via the HTTP server's websockify endpo
CVE-2020-5757 CRITICAL
9.8 Jul 17

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via HTTP. Rated cr
CVE-2020-5758 HIGH
8.8 Jul 17

Grandstream UCM6200 series firmware version 1.0.20.23 and below is vulnerable to OS command injection via HTTP. Rated hi

Same weakness CWE-78 – OS Command Injection

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Same technique Command Injection

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CVE-2012-1823 CRITICAL POC
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CVE-2016-1555 CRITICAL POC
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CVE-2014-6271 CRITICAL POC
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CVE-2015-2051 HIGH POC
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CVE-2014-6278 HIGH POC
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CVE-2017-6334 HIGH POC
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CVE-2024-50603 CRITICAL POC
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CVE-2025-64328 HIGH POC
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CVE-2020-5759 vulnerability details – vuln.today
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